I get between 2765 fps and 2800 fps with 91 grians Retumbo. Thats with a factory 26" tube. Its deffinatly on the hot end of the scale, but its where the gun wants to shoot. I highly doubt that you would gain anything by going to an edge... maybe with a 30" tube, but then still marginal.

Case capacity h20 is suppose to be about 6 gr. more than my Norma and I get 2725 w/ retubo 87.5 gr. fed 215, 300 berger. I have friends that push there Norma harder. I took mine higher but dont have my book now.